/* $OpenBSD: a_bitstr.c,v 1.20 2014/07/11 08:44:47 jsing Exp $ */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include #include #include #include int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len) { return M_ASN1_BIT_STRING_set(x, d, len); } int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp) { int ret, j, bits, len; unsigned char *p, *d; if (a == NULL) return (0); len = a->length; if (len > 0) { if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) { bits = (int)a->flags & 0x07; } else { for (; len > 0; len--) { if (a->data[len - 1]) break; } j = a->data[len - 1]; if (j & 0x01) bits = 0; else if (j & 0x02) bits = 1; else if (j & 0x04) bits = 2; else if (j & 0x08) bits = 3; else if (j & 0x10) bits = 4; else if (j & 0x20) bits = 5; else if (j & 0x40) bits = 6; else if (j & 0x80) bits = 7; else bits = 0; /* should not happen */ } } else bits = 0; ret = 1 + len; if (pp == NULL) return (ret); p= *pp; *(p++) = (unsigned char)bits; d = a->data; memcpy(p, d, len); p += len; if (len > 0) p[-1]&=(0xff << bits); *pp = p; return (ret); } ASN1_BIT_STRING * c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, const unsigned char **pp, long len) { ASN1_BIT_STRING *ret = NULL; const unsigned char *p; unsigned char *s; int i; if (len < 1) { i = ASN1_R_STRING_TOO_SHORT; goto err; } if ((a == NULL) || ((*a) == NULL)) { if ((ret = M_ASN1_BIT_STRING_new()) == NULL) return (NULL); } else ret = (*a); p = *pp; i = *(p++); /* We do this to preserve the settings. If we modify * the settings, via the _set_bit function, we will recalculate * on output */ ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */ ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */ if (len-- > 1) /* using one because of the bits left byte */ { s = malloc((int)len); if (s == NULL) { i = ERR_R_MALLOC_FAILURE; goto err; } memcpy(s, p, len); s[len - 1] &= (0xff << i); p += len; } else s = NULL; ret->length = (int)len; free(ret->data); ret->data = s; ret->type = V_ASN1_BIT_STRING; if (a != NULL) (*a) = ret; *pp = p; return (ret); err: ASN1err(ASN1_F_C2I_ASN1_BIT_STRING, i); if ((ret != NULL) && ((a == NULL) || (*a != ret))) M_ASN1_BIT_STRING_free(ret); return (NULL); } /* These next 2 functions from Goetz Babin-Ebell */ int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value) { int w, v, iv; unsigned char *c; w = n/8; v = 1 << (7 - (n & 0x07)); iv = ~v; if (!value) v = 0; if (a == NULL) return 0; a->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear, set on write */ if ((a->length < (w + 1)) || (a->data == NULL)) { if (!value) return(1); /* Don't need to set */ c = OPENSSL_realloc_clean(a->data, a->length, w + 1); if (c == NULL) { ASN1err(ASN1_F_ASN1_BIT_STRING_SET_BIT, ERR_R_MALLOC_FAILURE); return 0; } if (w + 1 - a->length > 0) memset(c + a->length, 0, w + 1 - a->length); a->data = c; a->length = w + 1; } a->data[w] = ((a->data[w]) & iv) | v; while ((a->length > 0) && (a->data[a->length - 1] == 0)) a->length--; return (1); } int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n) { int w, v; w = n / 8; v = 1 << (7 - (n & 0x07)); if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL)) return (0); return ((a->data[w] & v) != 0); } /* * Checks if the given bit string contains only bits specified by * the flags vector. Returns 0 if there is at least one bit set in 'a' * which is not specified in 'flags', 1 otherwise. * 'len' is the length of 'flags'. */ int ASN1_BIT_STRING_check(ASN1_BIT_STRING *a, unsigned char *flags, int flags_len) { int i, ok; /* Check if there is one bit set at all. */ if (!a || !a->data) return 1; /* Check each byte of the internal representation of the bit string. */ ok = 1; for (i = 0; i < a->length && ok; ++i) { unsigned char mask = i < flags_len ? ~flags[i] : 0xff; /* We are done if there is an unneeded bit set. */ ok = (a->data[i] & mask) == 0; } return ok; }